Spa shell



FIG. 1 is a perspective view of a spa shell showing our design;

FIG. 2 is a second perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a cross-sectional view thereof, taken along line 4-4 of FIG.3;

FIG. 5 is a cross-sectional view thereof, taken along line 5-5 of FIG.3;

FIG. 6 is a cross-sectional view thereof, taken along line 6-6 of FIG.3; and,

FIG. 7 is a cross-sectional view thereof, taken along line 7-7 of FIG.3.

The broken lines in the drawings represent unclaimed portions of the spashell and form no part of the claimed design.

CLAIM The ornamental design for a spa shell, as shown and described.